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Sorry for the lack of detail :oops: Boiler is Glowworm Ultimate, system is open-vented fully-pumped, Y plan (I think). 5 rads downstairs, 4 upstairs. Everything installed in 1997. HW Cylinder, Pump etc in upstairs cupboard. Boiler is in kitchen. James

Last week my central heating went off when it was set to be on, I managed to restart it by powering off/on the controller/boiler. Since last night the central heating only works when the hot water program is active. As soon as the HW program goes off then the central heating doesn't work...